<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input v-model="isall" type="checkbox" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in goodList" :key="index">
          <th><input v-model="item.checked" type="checkbox" /></th>
          <th>{{ item.name }}</th>
          <th>{{ item.price }}</th>
          <th>
            <button @click="sub(index)">-</button> {{ item.num
            }}<button @click="add(index)">+</button>
          </th>
          <th>
            <span>{{ (sum = item.price * item.num) }}</span>
          </th>
          <th><button @click="delFn(index)">删除</button></th>
        </tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">
            {{ sum2 }}
          </td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      goodList:JSON.parse(localStorage.getItem('haha')),
      // goodList: [
      //   {
      //     name: '诸葛亮',
      //     price: 1000,
      //     num: 1,
      //     checked: false,
      //   },
      //   {
      //     name: '蔡文姬',
      //     price: 1500,
      //     num: 1,
      //     checked: false,
      //   },
      //   {
      //     name: '妲己',
      //     price: 2000,
      //     num: 1,
      //     checked: false,
      //   },
      //   {
      //     name: '鲁班',
      //     price: 2200,
      //     num: 1,
      //     checked: false,
      //   },
      // ],
      checkedAll: '',
    }
  },
  methods: {
    // 加减数量
    add(index) {
      // console.log(this.goodList[index].num)
      this.goodList[index].num++
    },

    sub(index) {
      if (this.goodList[index].num > 0) {
        this.goodList[index].num--
      }
    },
    // 删除数据
    delFn(num) {
      console.log(num)
      this.goodList.splice(num, 1)
    },
  },
  computed: {
    sum2() {
      return this.goodList.reduce(
        (sum, item) => (sum = sum + item.num * item.price),
        0
      )
    },
    isall: {
      get() {
        return this.goodList.every((item) => item.checked)
      },
      set(val) {
        console.log(val)
        this.goodList.forEach((item) => (item.checked = val))
      },
    },
  },
  watch: {
    goodList: {
      deep: true,
      // immediate: true,
      handler() {
        localStorage.setItem('haha', JSON.stringify(this.goodList))
      },
    },
  },
}
</script>

<style></style>